WHAT IS WHITE NOISE?

White noise is sound which consists of all of the sound frequencies which are audible to the human ear. It is called white noise because a comparison is made to white light which contains all of the colours of the light spectrum. White noise is made up of 20,000 different tones between 20 and 20,000 Hz. Although white noise consists of all of the different sound frequencies when we hear our brains amplifies or prioritises higher pitched frequencies making them sound louder than lower pitched frequencies. This is why we hear white noise at a higher pitch than what the actual sound is. It might be compared to hearing a group of people talking in a room. It is difficult to pick out individual voices so we hear the noise as a blurred noise.